Question Text
Question 5 :
The velocity ratio of a combination of n moveable pulleys with a fixed pulley is always {tex}2^n{/tex}. Is it true or false?
Question 8 :
If kinetic energy of a body is 20 J, mass of the body is 10 kg. Then find the momentum of the body?
Question 9 :
A nut ids opened by a wrench of length of 10 cm. If the least force is required 10 N. Find the moment of force needed to turn the nut?
Question 10 :
A woman draws water from a well using a fixed pulley. The mas of the bucket and water together is 6 kg. The Force applied by the woman is 670 n. Calculate the mechanical advantage.
Question 11 :
The centre of gravity of a hollow cone of height h is at distance x from its vertex where the value of x is:
Question 13 :
An actual pulley system always has mechanical advantage less than velocity ratio. It is because :
Question 14 :
A beam of electrons has an energy of 1 joule. How many electrons are in the beam ? [1 eV = 1.6 x 10$^{-19}$]
Question 15 :
The correct relationship between the efficiency (η), mechanical advantage (M.A.) and velocity ratio (V.R.) of an actual machine is :
